WO2019208359A1 - 基板処理システム及び基板処理方法 - Google Patents
基板処理システム及び基板処理方法 Download PDFInfo
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- WO2019208359A1 WO2019208359A1 PCT/JP2019/016467 JP2019016467W WO2019208359A1 WO 2019208359 A1 WO2019208359 A1 WO 2019208359A1 JP 2019016467 W JP2019016467 W JP 2019016467W WO 2019208359 A1 WO2019208359 A1 WO 2019208359A1
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- substrate
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/302—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to change their surface-physical characteristics or shape, e.g. etching, polishing, cutting
- H01L21/304—Mechanical treatment, e.g. grinding, polishing, cutting
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- H—ELECTRICITY
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- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/67005—Apparatus not specifically provided for elsewhere
- H01L21/67242—Apparatus for monitoring, sorting or marking
- H01L21/67259—Position monitoring, e.g. misposition detection or presence detection
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/0006—Working by laser beam, e.g. welding, cutting or boring taking account of the properties of the material involved
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
- B23K26/03—Observing, e.g. monitoring, the workpiece
- B23K26/032—Observing, e.g. monitoring, the workpiece using optical means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
- B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
- B23K26/0604—Shaping the laser beam, e.g. by masks or multi-focusing by a combination of beams
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
- B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
- B23K26/062—Shaping the laser beam, e.g. by masks or multi-focusing by direct control of the laser beam
- B23K26/0622—Shaping the laser beam, e.g. by masks or multi-focusing by direct control of the laser beam by shaping pulses
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/08—Devices involving relative movement between laser beam and workpiece
- B23K26/0823—Devices involving rotation of the workpiece
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/08—Devices involving relative movement between laser beam and workpiece
- B23K26/083—Devices involving movement of the workpiece in at least one axial direction
- B23K26/0853—Devices involving movement of the workpiece in at least in two axial directions, e.g. in a plane
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/08—Devices involving relative movement between laser beam and workpiece
- B23K26/0869—Devices involving movement of the laser head in at least one axial direction
- B23K26/0876—Devices involving movement of the laser head in at least one axial direction in at least two axial directions
- B23K26/0884—Devices involving movement of the laser head in at least one axial direction in at least two axial directions in at least in three axial directions, e.g. manipulators, robots
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/50—Working by transmitting the laser beam through or within the workpiece
- B23K26/53—Working by transmitting the laser beam through or within the workpiece for modifying or reforming the material inside the workpiece, e.g. for producing break initiation cracks
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/50—Working by transmitting the laser beam through or within the workpiece
- B23K26/57—Working by transmitting the laser beam through or within the workpiece the laser beam entering a face of the workpiece from which it is transmitted through the workpiece material to work on a different workpiece face, e.g. for effecting removal, fusion splicing, modifying or reforming
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B5/00—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor
- B24B5/02—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor involving centres or chucks for holding work
- B24B5/04—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor involving centres or chucks for holding work for grinding cylindrical surfaces externally
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- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02002—Preparing wafers
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- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02002—Preparing wafers
- H01L21/02005—Preparing bulk and homogeneous wafers
- H01L21/02008—Multistep processes
- H01L21/0201—Specific process step
- H01L21/02021—Edge treatment, chamfering
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- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/26—Bombardment with radiation
- H01L21/263—Bombardment with radiation with high-energy radiation
- H01L21/268—Bombardment with radiation with high-energy radiation using electromagnetic radiation, e.g. laser radiation
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- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
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- H01L21/67011—Apparatus for manufacture or treatment
- H01L21/67092—Apparatus for mechanical treatment
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- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/67005—Apparatus not specifically provided for elsewhere
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- H01L21/67115—Apparatus for thermal treatment mainly by radiation
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- H01L21/67288—Monitoring of warpage, curvature, damage, defects or the like
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- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/68—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for positioning, orientation or alignment
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/683—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping
- H01L21/687—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping using mechanical means, e.g. chucks, clamps or pinches
- H01L21/68714—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping using mechanical means, e.g. chucks, clamps or pinches the wafers being placed on a susceptor, stage or support
- H01L21/68764—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping using mechanical means, e.g. chucks, clamps or pinches the wafers being placed on a susceptor, stage or support characterised by a movable susceptor, stage or support, others than those only rotating on their own vertical axis, e.g. susceptors on a rotating caroussel
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- H01L22/00—Testing or measuring during manufacture or treatment; Reliability measurements, i.e. testing of parts without further processing to modify the parts as such; Structural arrangements therefor
- H01L22/10—Measuring as part of the manufacturing process
- H01L22/12—Measuring as part of the manufacturing process for structural parameters, e.g. thickness, line width, refractive index, temperature, warp, bond strength, defects, optical inspection, electrical measurement of structural dimensions, metallurgic measurement of diffusions
Definitions
- the present disclosure relates to a substrate processing system and a substrate processing method.
- Patent Document 1 a disk-shaped grinding tool having abrasive grains on its outer peripheral portion is rotated, and at least the outer peripheral surface of the grinding tool is linearly brought into contact with the semiconductor wafer so that the peripheral end portion of the semiconductor wafer is substantially omitted. Grinding into an L shape is disclosed.
- the semiconductor wafer is produced by bonding two silicon wafers.
- the technique according to the present disclosure appropriately removes the peripheral portion of one substrate in a superposed substrate in which the substrates are bonded to each other.
- One aspect of the present disclosure is a substrate processing system for processing a substrate, and an eccentricity detection device that detects an eccentricity of the first substrate in a superposed substrate in which a first substrate and a second substrate are bonded;
- a modified layer forming apparatus for forming a modified layer in the first substrate along a boundary between a peripheral portion and a central portion to be removed in the first substrate, and the peripheral edge based on the modified layer
- a peripheral edge removing device for removing the portion.
- the peripheral portion of one substrate can be appropriately removed in the superposed substrate in which the substrates are bonded to each other.
- the end surface grinding apparatus has a chuck table, a spindle, and a diamond wheel.
- the chuck table mounts a wafer and rotates about the Z-axis direction (vertical direction) as a rotation axis.
- the spindle is attached with a diamond wheel at the tip, and rotates about the Y-axis direction (horizontal direction) as a rotation axis.
- the spindle moves in the Y axis direction and the Z direction.
- the diamond wheel is a disc-shaped grinding tool in which diamond abrasive grains are provided on the outer periphery.
- the diamond wheel When grinding the edge of the wafer edge using such an edge grinder, the diamond wheel is brought into contact with the wafer by moving the spindle in the Y-axis and Z-axis directions while rotating the chuck table. Let And the peripheral part of a wafer is ground in a substantially L shape.
- the wafer is thinned by grinding the back surface of the wafer having a plurality of devices such as electronic circuits formed on the surface. If the thinned wafer is transported as it is or if subsequent processing is performed, the wafer may be warped or cracked. Therefore, in order to reinforce the wafer, for example, the wafer is attached to a support substrate.
- the peripheral edge of the wafer is chamfered, but when the wafer is ground as described above, the peripheral edge of the wafer becomes a sharp and sharp shape (so-called knife edge shape). Then, chipping occurs at the peripheral edge of the wafer, and the wafer may be damaged. Therefore, so-called edge trimming is performed in which the peripheral edge of the wafer is cut in advance before the grinding process.
- the above-described end surface grinding apparatus described in Patent Document 1 is an apparatus that performs this edge trimming.
- the movement of the spindle in the Z-axis direction may not be constant due to various factors such as tolerances.
- the movement of the diamond wheel in the Z-axis direction is not properly controlled, and the surface of the support substrate may be ground. Therefore, there is room for improvement in the conventional edge trim.
- FIG. 1 is a plan view schematically showing the outline of the configuration of the substrate processing system 1.
- a wafer W to be processed as a first substrate and a support wafer S as a second substrate are bonded to form a superposed wafer T, and further the wafer to be processed Thin W.
- a surface to be processed surface opposite to the surface bonded to the support wafer S
- a surface opposite to the processed surface Wg is referred to as “non-processed surface Wn”.
- bonded surface Sj a surface opposite to the bonded surface Sj is referred to as a “non-bonded surface Sn”.
- the processing target wafer W is a semiconductor wafer such as a silicon wafer, for example, and a device layer D including a plurality of devices is formed on the non-processed surface Wn.
- the device layer D is further formed with an oxide film Fw, for example, a SiO 2 film.
- Fw oxide film
- the peripheral part of the to-be-processed wafer W is chamfered, and the thickness of the cross section of the peripheral part becomes small toward the front-end
- the support wafer S is a wafer that supports the wafer W to be processed.
- An oxide film Fs for example, a SiO 2 film is formed on the bonding surface Sj of the support wafer S.
- the support wafer S functions as a protective material that protects the device on the non-processed surface Wn of the wafer W to be processed.
- a device layer (not shown) is formed on the bonding surface Sj as with the processing target wafer W.
- the device layer D and the oxide films Fw and Fs are not shown in order to avoid the complexity of the illustration. Similarly, in other drawings used in the following description, the device layer D and the oxide films Fw and Fs may be omitted.
- the substrate processing system 1 has a configuration in which a carry-in / out station 2 and a processing station 3 are integrally connected.
- a cassette Ct that can accommodate a plurality of superposed wafers T is carried in / out.
- the processing station 3 includes various processing apparatuses that perform predetermined processing on the overlapped wafer T.
- the cassette loading table 10 is provided at the loading / unloading station 2.
- a plurality of, for example, four cassettes Ct can be placed on the cassette mounting table 10 in a line in the X-axis direction.
- the number of cassettes Ct mounted on the cassette mounting table 10 is not limited to this embodiment, and can be arbitrarily determined.
- a wafer transfer area 20 is provided adjacent to the cassette mounting table 10.
- the wafer transfer area 20 is provided with a wafer transfer device 22 that is movable on a transfer path 21 extending in the X-axis direction.
- the wafer transfer device 22 has, for example, two transfer arms 23 and 23 that hold and transfer the overlapped wafer T.
- Each transfer arm 23 is configured to be movable in the horizontal direction, the vertical direction, the horizontal axis, and the vertical axis.
- the structure of the conveyance arm 23 is not limited to this embodiment, Arbitrary structures can be taken.
- a wafer transfer area 30 is provided in the processing station 3.
- the wafer transfer area 30 is provided with a wafer transfer device 32 that can move on a transfer path 31 extending in the X-axis direction.
- the wafer transfer device 32 is configured to be able to transfer the overlapped wafer T to a transition device 34, wet etching devices 40 and 41, and a processing device 50, which will be described later.
- the wafer transfer device 32 includes, for example, two transfer arms 33 and 33 that hold and transfer the overlapped wafer T.
- Each transfer arm 33 is configured to be movable in the horizontal direction, the vertical direction, the horizontal axis, and the vertical axis.
- the configuration of the transfer arm 33 is not limited to the present embodiment, and an arbitrary configuration can be taken.
- a transition device 34 for delivering the overlapped wafer T is provided.
- wet etching apparatuses 40 and 41 are arranged in this order from the loading / unloading station 2 side in the X axis direction.
- wet etching is performed on the processing surface Wg of the processing target wafer W with a chemical solution such as hydrofluoric acid.
- a processing device 50 is disposed on the positive side of the wafer transfer area 30 in the X axis direction. In the processing apparatus 50, processing such as grinding and cleaning is performed on the processing target wafer W.
- the above substrate processing system 1 is provided with a control device 60.
- the control device 60 is, for example, a computer and has a program storage unit (not shown).
- the program storage unit stores a program for controlling the processing of the superposed wafer T in the substrate processing system 1.
- the program storage unit also stores a program for controlling the operation of drive systems such as the above-described various processing apparatuses and transfer apparatuses to realize substrate processing described later in the substrate processing system 1.
- the program may be recorded on a computer-readable storage medium H and may be installed in the control device 60 from the storage medium H.
- the processing apparatus 50 includes a rotary table 70, a transport unit 80, a processing unit 90, a first cleaning unit 110, a second cleaning unit 120, a rough grinding unit 130, a middle grinding unit 140, and a finish grinding unit 150. Yes.
- the rotary table 70 is configured to be rotatable by a rotation mechanism (not shown).
- a rotation mechanism not shown
- On the rotary table 70 four chucks 71 for holding the superposed wafer T by suction are provided.
- the chucks 71 are arranged on the same circumference as the rotary table 70, that is, every 90 degrees.
- the four chucks 71 are movable to the delivery position A0 and the processing positions A1 to A3 as the rotary table 70 rotates.
- Each of the four chucks 71 is configured to be rotatable about a vertical axis by a rotation mechanism (not shown).
- the delivery position A0 is a position on the X-axis negative direction side and the Y-axis negative direction side of the turntable 70.
- the second cleaning unit 120 and the processing unit are located on the X-axis negative direction side of the delivery position A0.
- 90 and the first cleaning unit 110 are arranged side by side.
- the processing unit 90 and the first cleaning unit 110 are stacked in this order from above.
- the first machining position A1 is a position on the X axis positive direction side and the Y axis negative direction side of the turntable 70, and the rough grinding unit 130 is disposed.
- the second machining position A2 is a position on the X-axis positive direction side and the Y-axis positive direction side of the turntable 70, and the intermediate grinding unit 140 is disposed.
- the third machining position A3 is a position on the X-axis negative direction side and the Y-axis positive direction side of the rotary table 70, and the finish grinding unit 150 is disposed.
- the transport unit 80 is a multi-joint type robot including a plurality of, for example, three arms 81. Each of the three arms 81 is configured to be rotatable. A transfer pad 82 for adsorbing and holding the overlapped wafer T is attached to the tip arm 81. The proximal arm 81 is attached to a moving mechanism 83 that moves the arm 81 in the vertical direction.
- the transfer unit 80 having such a configuration can transfer the overlapped wafer T to the delivery position A0, the processing unit 90, the first cleaning unit 110, and the second cleaning unit 120.
- the horizontal direction of the superposed wafer T before the grinding process is adjusted. For example, while detecting the position of the notch portion of the wafer W to be processed by a detection unit (not shown) while rotating the overlapped wafer T held on the chuck 91, the position of the notch portion is adjusted to adjust the overlapped wafer T. Adjust the horizontal direction of the.
- the processing unit 90 includes a chuck 91 as a holding unit that holds the superposed wafer T in a state where the wafer W to be processed is on the upper side and the support wafer S is arranged on the lower side. Yes.
- the chuck 91 is configured to be movable in the X axis direction and the Y axis direction by a moving mechanism 92.
- the moving mechanism 92 is composed of a general precision XY stage.
- the chuck 91 is configured to be rotatable around a vertical axis by a rotation mechanism 93.
- a laser head 94 as a reforming unit that irradiates the inside of the wafer W to be processed with laser light.
- the laser head 94 is a high-frequency pulsed laser beam oscillated from a laser beam oscillator (not shown), and transmits a laser beam having a wavelength that is transmissive to the wafer W to be processed. Condensed and irradiated at a predetermined position inside. As a result, as shown in FIG. 5, the portion where the laser beam L is condensed inside the wafer W to be processed is modified, and the modified layer M is formed.
- the modified layer M extends in the plate thickness direction and has a vertically long aspect ratio. As shown in FIG.
- the laser head 94 is configured to be movable in the X axis direction and the Y axis direction by a moving mechanism 95.
- the moving mechanism 95 is composed of a general precision XY stage.
- the laser head 94 is configured to be movable in the Z-axis direction by an elevating mechanism 96.
- the processing unit 90 detects the eccentricity of the processing target wafer W in the superposed wafer T.
- an eccentricity detection unit 97 is provided above the center of the chuck 91.
- the eccentricity detection unit 97 is configured to be movable in the X-axis direction, the Y-axis direction, and the Z-axis direction by a moving mechanism (not shown).
- the eccentricity detection unit 97 has a CCD camera, for example.
- the eccentricity detection unit 97 images at least three points on the overlapped wafer T held by the chuck 91, specifically, for example, the outer peripheral portion.
- the configuration of the eccentricity detection unit 97 is not limited to this embodiment, and may include, for example, an IR camera. In such a case, the eccentricity detection unit 97 images an alignment mark formed on the processing target wafer W, for example, and detects the eccentricity of the processing target wafer W in the overlapped wafer T.
- the overlapped wafer T is first held by the chuck 91.
- the eccentricity detection unit 97 images the overlapped wafer T, and detects the eccentricity of the wafer W to be processed in the overlapped wafer T.
- the detection result of the eccentricity detection unit 97 is output to the control device 60.
- the laser light L from the laser head 94 is radiated to the wafer W to be processed in an annular shape. At this time, if the wafer W to be processed is eccentric, the laser light L for the wafer W to be processed is also eccentric.
- control device 60 adjusts the central axis of the chuck 91 and controls the moving mechanism 92 so that the laser beam L from the laser head 94 is not decentered. Then, the chuck 91 is moved in the horizontal direction by the moving mechanism 92 to adjust the position of the center of the wafer W to be processed in the overlapped wafer T.
- the laser head 94 is moved in the horizontal direction by the moving mechanism 95, and the laser head 94 is positioned immediately above a predetermined position of the superposed wafer T (processed wafer W). Adjust the position as follows. After that, while rotating the chuck 91 by the rotating mechanism 93, the laser head 94 irradiates the inside of the wafer W to be processed with the laser light L, so that the annular modified layer M is formed on the wafer W to be processed as shown in FIG. Form.
- the formation position of the modified layer M on the processing target wafer W will be described in detail.
- the processing surface Wg of the processing target wafer W bonded to the support wafer S is ground.
- the peripheral part is removed before.
- the modified layer M serves as a base point for the removal of the peripheral edge, and is annularly formed along the boundary between the peripheral edge We to be removed and the central part Wc in the processing target wafer W as shown in FIG. It is formed.
- the peripheral edge We is, for example, in the range of 0.5 mm to 2.0 mm in the radial direction from the end of the wafer W to be processed, and includes a chamfered portion.
- the lower end of the modified layer M is located above the target surface (dotted line in FIG. 5) of the wafer W to be processed after grinding. That is, the distance H1 between the lower end of the modified layer M and the non-processed surface Wn of the processing target wafer W is larger than the target thickness H2 of the processing target wafer W after grinding.
- the distance H1 is arbitrary, but is, for example, 5 ⁇ m to 10 ⁇ m larger than the target thickness H2. In such a case, the modified layer M does not remain on the processing target wafer W after grinding.
- the chuck 91 is moved in the horizontal direction.
- the laser head 94 may be moved in the horizontal direction, or both the chuck 91 and the laser head 94 are moved in the horizontal direction. You may let them. Further, although the chuck 91 is rotated, the laser head 94 may be rotated.
- the processed surface Wg of the wafer W to be processed after the grinding process is cleaned, more specifically, spin cleaning.
- the cleaning liquid is supplied from the cleaning liquid nozzle (not shown) to the processing surface Wg while rotating the superposed wafer T held on the spin chuck (not shown). Then, the supplied cleaning liquid diffuses on the processing surface Wg, and the processing surface Wg is cleaned.
- the second cleaning unit 120 cleans the non-bonded surface Sn of the support wafer S in a state where the processed wafer W after the grinding process is held on the transport pad 82 and cleans the transport pad 82.
- the rough grinding unit 130 the processing surface Wg of the wafer W to be processed is roughly ground.
- the rough grinding unit 130 has a rough grinding part 131.
- the rough grinding unit 131 includes a rough grinding wheel 132, a spindle 133, and a drive unit 134.
- the rough grinding wheel 132 is provided in an annular shape above the chuck 71.
- the rough grinding wheel 132 is provided with a drive unit 134 via a spindle 133.
- the drive unit 134 includes, for example, a motor (not shown), and rotates the rough grinding wheel 132 and moves it in the vertical and horizontal directions along the support pillar 135 shown in FIG.
- the chuck 71 and the coarse grinding wheel 132 are respectively rotated in a state in which the processing target wafer W held by the chuck 71 and a part of the arc of the coarse grinding wheel 132 are in contact with each other.
- the processing surface Wg of the wafer W to be processed is ground.
- the processing surface Wg of the wafer W to be processed is ground.
- the configuration of the intermediate grinding unit 140 is substantially the same as the configuration of the rough grinding unit 130 as shown in FIGS. 1 and 7, and the intermediate grinding unit 141, the intermediate grinding wheel 142, the spindle 143, the drive unit 144, and the support column 145 are provided. Have.
- the grain size of the abrasive grains of the medium grinding wheel 142 is smaller than that of the coarse grinding wheel 132.
- the finish grinding unit 150 finish-grinds the processed surface Wg of the wafer W to be processed.
- the configuration of the finish grinding unit 150 is substantially the same as that of the intermediate grinding unit 140 as shown in FIGS. 1 and 7, and includes a finish grinding unit 151, a finish grinding wheel 152, a spindle 153, a drive unit 154, and a support column 155. Have.
- the grain size of the finish grinding wheel 152 is smaller than the grain size of the middle grinding wheel 142.
- the processing unit 90 has a laser head 94 as a reforming unit, and the processing apparatus 50 constitutes a reformed layer forming apparatus. Moreover, in this embodiment, the processing unit 90 has the eccentricity detection part 97, and the processing apparatus 50 comprises the eccentricity detection apparatus. Furthermore, in this embodiment, as will be described later, the peripheral edge We of the wafer W to be processed is removed in the rough grinding unit 130 (or the rough grinding unit 130 and the intermediate grinding unit 140), and the processing apparatus 50 constitutes a peripheral edge removal apparatus. is doing.
- the wafer W to be processed and the support wafer S are bonded by van der Waals force and hydrogen bond (intermolecular force), and polymerization is performed in advance.
- a wafer T is formed.
- a cassette Ct storing a plurality of superposed wafers T is placed on the cassette placing table 10 of the loading / unloading station 2.
- the overlapped wafer T in the cassette Ct is taken out by the wafer transfer device 22 and transferred to the transition device 34.
- the overlapped wafer T of the transition device 34 is taken out by the wafer transfer device 32 and transferred to the processing device 50.
- the superposed wafer T transferred to the processing apparatus 50 is delivered to the processing unit 90.
- the overlapped wafer T is transferred from the wafer transfer device 32 to the chuck 91 and held. Thereafter, the horizontal direction of the wafer W to be processed is adjusted by a detection unit (not shown).
- the eccentricity detection unit 97 images the overlapped wafer T, and the eccentricity of the wafer W to be processed in the overlapped wafer T held by the chuck 91 is detected.
- the detection result of the eccentricity detection unit 97 is output to the control device 60.
- the central axis of the chuck 91 is adjusted based on the detection result of the eccentricity detection unit 97, that is, the eccentricity of the wafer W to be processed. Specifically, when the modified layer M is formed in a subsequent process, the central axis of the chuck 91 is adjusted so that the laser light L from the laser head 94 is not decentered with respect to the wafer W to be processed.
- the moving mechanism 92 is controlled by the control device 60, and the chuck 91 is moved in the horizontal direction by the moving mechanism 92.
- the position adjustment of the center of the wafer W to be processed in the overlapped wafer T is performed.
- the eccentricity detecting unit 97 determines that the wafer W to be processed is not eccentric, the central axis of the chuck 91 does not need to move.
- the laser head 94 is moved in the horizontal direction by the moving mechanism 95, and the laser head 94 is positioned immediately above a predetermined position of the superposed wafer T (processed wafer W). Adjust the position as follows. This predetermined position is the boundary between the peripheral edge We and the center Wc of the wafer W to be processed. Thereafter, while rotating the chuck 91 by the rotation mechanism 93, the laser light L is irradiated from the laser head 94 to the inside of the processing target wafer W, and the processing target wafer W is annularly modified as shown in FIG. Layer M is formed.
- the laser beam L is not decentered with respect to the wafer W to be processed, and the modified layer M is formed at an appropriate position. Can do.
- the formation position of the wafer W to be processed is as described with reference to FIGS. 5 and 6 described above.
- the overlapped wafer T is transferred from the processing unit 90 to the delivery position A0 by the transfer unit 80, and is transferred to the chuck 71 at the delivery position A0. Thereafter, the chuck 71 is moved to the first processing position A1. Then, the processed surface Wg of the wafer W to be processed is roughly ground by the rough grinding unit 130 as shown in FIG. Specifically, by rotating the chuck 71 and the rough grinding wheel 132 while lowering the rough grinding wheel 132 in a state where a part of the arc of the processing target wafer W and the rough grinding wheel 132 is in contact with each other, The processing surface Wg of the wafer W to be processed is ground.
- a crack C propagates from the modified layer M in the thickness direction inside the processing target wafer W, and reaches the processed surface Wg and the non-processed surface Wn.
- the crack C progresses substantially linearly because the wafer W to be processed has a single crystal of silicon.
- the crack C is formed in an annular shape in plan view. Note that the crack C may develop when the modified layer M is formed in the processing unit 90. In other words, the timing at which the crack C is formed may be when the processed surface Wg in the rough grinding unit 130 is ground, or may be when the modified layer M is formed in the processing unit 90.
- the peripheral edge We of the wafer W to be processed is peeled off and removed from the modified layer M and the crack C as shown in FIG. 8C.
- the crack C has progressed substantially linearly, the outer surface of the wafer W to be processed after being removed can be made flat with few irregularities.
- the modified layer M is removed during grinding of the processed surface Wg.
- the modified layer M is amorphous and has low strength. In this respect, in the present embodiment, since the modified layer M does not remain on the processing target wafer W after grinding, a strong strength can be ensured.
- the chuck 71 is moved to the second processing position A2. Then, the processing surface Wg of the processing target wafer W is ground by the middle grinding unit 140.
- the peripheral edge portion We is completely removed by the intermediate grinding unit 140. That is, the peripheral edge We may be removed in two stages of the rough grinding unit 130 and the middle grinding unit 140. In such a case, the size of the peripheral edge We to be removed can be reduced stepwise. That is, the peripheral edge portion We removed by the grinding units 130 and 140 is reduced.
- the chuck 71 is moved to the third processing position A3. Then, the processed surface Wg of the processing target wafer W is finish-ground by the finish grinding unit 150.
- the chuck 71 is moved to the delivery position A0.
- the processing surface Wg of the wafer W to be processed is roughly cleaned with the cleaning liquid using a cleaning liquid nozzle (not shown). At this time, cleaning is performed to remove dirt on the processed surface Wg to some extent.
- the overlapped wafer T is transferred from the delivery position A0 to the second cleaning unit 120 by the transfer unit 80.
- the second cleaning unit 120 the non-joint surface Sn of the support wafer S is cleaned and dried in a state where the processing target wafer W is held on the transfer pad 82.
- the overlapped wafer T is transferred from the second cleaning unit 120 to the first cleaning unit 110 by the transfer unit 80.
- the processing surface Wg of the wafer W to be processed is finished and cleaned with the cleaning liquid using a cleaning liquid nozzle (not shown). At this time, the processed surface Wg is washed to a desired cleanliness and dried.
- the overlapped wafer T is sequentially transferred to the wet etching apparatuses 40 and 41 by the wafer transfer apparatus 32, and the processed surface Wg is wet etched in two stages.
- the superposed wafer T that has been subjected to all the processes is transferred to the transition device 34 by the wafer transfer device 32 and further transferred to the cassette Ct of the cassette mounting table 10 by the wafer transfer device 22.
- a series of wafer processing in the substrate processing system 1 is completed.
- the peripheral portion of the wafer to be processed is ground and removed by the wheel
- the vertical movement of the wheel is caused by various factors such as tolerance. If not properly controlled, the surface of the supporting wafer may be ground.
- the peripheral edge We can be removed with the modified layer M and the crack C as a starting point. In such a case, the bonding surface Sj of the support wafer S is not damaged by grinding or the like.
- peripheral edge of the wafer to be processed is ground and removed with a wheel as before, the wafer to be processed and the support wafer are bonded together, particles may be generated by the grinding, and the particles may adhere to the device of the wafer to be processed. .
- the peripheral edge We is peeled and removed based on the modified layer M and the crack C formed inside the processing target wafer W, no particles are generated.
- the wheel When a wheel is used as in the prior art, the wheel is lowered to grind the peripheral portion, and therefore the rotational speed of the chuck that holds the wafer to be processed is limited, and it takes time to remove the peripheral portion.
- the modified layer M is formed inside the wafer W to be processed using a high frequency laser, the rotation speed of the chuck 91 can be increased, and the processing can be performed in an extremely short time. It can be carried out. Therefore, the throughput of wafer processing can be improved.
- a notch for indicating the direction of crystal orientation is formed in the wafer W to be processed which is a semiconductor wafer.
- the peripheral edge We is removed only by a conventional blade, the shape of the notch is left as it is. It was difficult.
- the modified layer M can be formed in accordance with the shape of the notch by controlling the operation of the processing target wafer W and the laser light relatively. The peripheral edge portion We can be easily removed while leaving the shape of the notch.
- the eccentricity detection unit 97 detects the eccentricity of the wafer W to be processed in the superposed wafer T. Based on the detection result, the central axis of the chuck 91 is adjusted to eliminate the eccentricity of the wafer W to be processed, and the position of the center of the wafer W to be processed in the overlapped wafer T is adjusted. Then, the laser beam L irradiated from the laser head 94 to the inside of the wafer to be processed W is not decentered, and the annular modified layer M can be formed at an appropriate position inside the wafer to be processed W.
- the central axis of the chuck 91 is adjusted based on the detection result of the eccentricity detection unit 97 (the eccentricity of the wafer W to be processed), but the irradiation axis of the laser light L from the laser head 94 is adjusted. May be.
- the laser head 94 is moved in the horizontal direction by the moving mechanism 95 to adjust the irradiation axis of the laser light L from the laser head 94. Even in such a case, the laser beam L irradiated from the laser head 94 to the inside of the wafer to be processed W can be prevented from being decentered, and the annular modified layer M can be formed at an appropriate position inside the wafer to be processed W. it can.
- the eccentricity detection unit 97 is provided in the processing unit 90, but may be provided outside the processing apparatus 50.
- an eccentricity detection device (not shown) including a chuck 91, a movement mechanism 92, a rotation mechanism 93, and an eccentricity detection unit 97 is provided at an arbitrary position in the processing station 3 of the substrate processing system 1.
- the eccentricity of the wafer W to be processed in the overlapped wafer T is detected by the eccentricity detection device (eccentricity detection unit 97).
- the detection result of the eccentricity detection device is output to the control device 60.
- the control device 60 controls the wafer transfer device 32 based on the detection result of the eccentricity detection device. Specifically, when the overlapped wafer T is transferred from the eccentricity detection device to the processing unit 90 by the wafer transfer device 32, the overlapped wafer T is transferred so that the center of the wafer W to be processed and the center of the chuck 91 coincide. Then, the laser beam L irradiated from the laser head 94 to the inside of the wafer to be processed W is not decentered, and the annular modified layer M can be formed in an appropriate position inside the wafer to be processed W.
- the following method is available as a method for efficiently removing the peripheral edge We when grinding the processed surface Wg.
- the rotation direction of the rough grinding stone 132 may be rotated from the outside to the inside of the processing target wafer W with respect to the rotating processing target wafer W.
- the rotation direction of the rough grinding wheel 132 may be rotated from the inside to the outside of the processing target wafer W with respect to the rotating processing target wafer W.
- the rotation direction of the rough grinding wheel 132 can be changed according to the type of the wafer W to be processed and the processing steps.
- the peripheral edge We may be efficiently removed (flighted) by applying high-pressure water to the peripheral edge We from the inside to the outside of the processing target wafer W.
- this first processed wafer W is referred to as a first processed wafer W1.
- This superposed wafer T is laminated and bonded to the next wafer to be processed W as shown in FIG. 9A, for example, in a bonding apparatus (not shown) outside the substrate processing system 1.
- this second processed wafer W is referred to as a second processed wafer W2.
- the processed surface Wg of the first wafer to be processed W1 and the non-processed surface Wn of the second wafer to be processed W2 are bonded to form a superposed wafer T.
- the superposed wafer T to which the second wafer to be processed W2 is bonded is transferred to the substrate processing system 1 while being accommodated in the cassette Ct.
- the overlapped wafer T is transferred to the processing unit 90 of the processing apparatus 50 by the wafer transfer device 32.
- the processing unit 90 after the superposed wafer T is delivered to and held by the chuck, the horizontal direction of the second wafer to be processed W2 is adjusted by a detection unit (not shown).
- the eccentricity detection unit 97 images the overlapped wafer T, and the eccentricity of the second wafer to be processed W2 in the overlapped wafer T is detected. Based on the detection result of the eccentricity of the second processed wafer W2, the center axis of the chuck 91 is adjusted to adjust the center of the second processed wafer W2 in the overlapped wafer T. Alternatively, the irradiation axis of the laser light L from the laser head 94 may be adjusted based on the detection result of the eccentricity of the second wafer to be processed W2. Then, the laser head 94 is moved above the peripheral edge We.
- the laser beam L is irradiated from the laser head 94 to the inside of the second wafer to be processed W2 while rotating the chuck 91, and a predetermined inside of the second wafer to be processed W2 as shown in FIG. 9B.
- the modified layer M is formed at the position.
- the overlapped wafer T is transferred by the transfer unit 80 to the chuck 71 at the transfer position A0, and the chuck 71 is moved to the first processing position A1.
- the processing surface Wg of the second wafer to be processed W2 is ground by the rough grinding wheel 132.
- the peripheral edge portion We is removed with the modified layer M and the crack C as base points.
- the chuck 71 is moved to the second processing position A2. Then, the processing surface Wg of the second wafer to be processed W2 is subjected to intermediate grinding by the intermediate grinding unit 140.
- the peripheral edge portion We is completely removed by the intermediate grinding unit 140.
- the chuck 71 is moved to the third processing position A3. Then, the processed surface Wg of the second wafer to be processed W2 is finish-ground by the finish grinding unit 150.
- the subsequent processing for the second wafer to be processed W2 is the same as in the above embodiment. That is, cleaning of the non-joint surface Sn in the second cleaning unit 120, cleaning of the processed surface Wg in the first cleaning unit 110, wet etching of the processed surface Wg in the wet etching apparatuses 40 and 41, and the like are performed. Thus, a series of wafer processing in the substrate processing system 1 is completed.
- the peripheral portion We of the second wafer to be processed W2 is removed from the overlapped wafer T shown in FIG. 9A using a wheel as in the prior art, the second wafer to be processed W2 is removed. Since the lower part of the non-processed surface Wn is hollow, it is difficult to grind the peripheral edge We.
- the peripheral edge We can be easily removed with the modified layer M and the crack C as a starting point. Can do.
- the width (trim width) of the peripheral edge portion that is ground and removed by the wheel or blade also varies, and in particular, the variation in stacking the wafers to be processed is accumulated. For this reason, for example, the upper layer wafer to be processed may protrude from the lower layer wafer.
- the modified layer M is formed inside the second wafer to be processed W2 using a laser, high accuracy can be secured, and the second wafer to be processed W2 can be secured. It can be properly laminated.
- the peripheral edge We removed by the upper second wafer to be processed W2 is replaced by the peripheral edge removed by the lower first wafer to be processed W1. It may be inside the portion We. That is, as shown in FIG. 10A, the modified layer M inside the second wafer to be processed W2 may be formed radially inward from the end portion of the first wafer to be processed W1. In such a case, as shown in FIG. 10B, the diameter of the second wafer to be processed W2 finally stacked is smaller than the diameter of the first wafer to be processed W1. As a result, it is possible to reliably prevent the second wafer to be processed W2 from protruding from the first wafer to be processed W1.
- the laser beam is transmitted to the non-processed surface Wn of the wafer W to be processed, and ablation occurs at each interface.
- the processing unit 90 has a laser head 200, a moving mechanism 201, and an elevating mechanism 202 as an interface processing unit in the configuration of the processing unit 90 shown in FIG. Yes.
- the laser head 200 is modified by irradiating the non-processed surface Wn with laser light.
- the laser head 200 is a high-frequency pulsed laser beam oscillated from a laser beam oscillator (not shown), and transmits a laser beam having a wavelength that is transmissive to the wafer W to be processed. Condensed and irradiated at a predetermined position inside. As a result, the portion where the laser beam is condensed inside the wafer to be processed W is modified.
- the moving mechanism 201 moves the laser head 200 in the X axis direction and the Y axis direction.
- the moving mechanism 201 is composed of a general precision XY stage.
- the lifting mechanism 202 moves the laser head 200 in the Z-axis direction.
- the processing unit 90 has a laser head 200 as a reforming unit, and the processing apparatus 50 constitutes an interface processing apparatus.
- the processing unit 90 processes the interface between the processing target wafer W and the support wafer S, the inside of the processing target wafer W is modified or the inside of the device layer D is modified. That is, the interface in the present embodiment includes the inside of the processing target wafer W and the inside of the device layer D.
- the modified surface R1 is formed in the vicinity of the non-processed surface Wn at the peripheral edge We (outside the modified layer M).
- a laser beam L is irradiated from the laser head 200 toward the inside of the processing target wafer W as shown in FIG.
- the laser light L passes through the inside of the processing target wafer W and is condensed, and the condensed portion is modified.
- the laser light L is irradiated from the laser head 200 to the inside of the wafer W to be processed.
- a modified surface R1 is formed.
- the chuck 91 may be moved in the radial direction by the moving mechanism 92, or both the laser head 200 and the chuck 91 may be moved.
- the modified surface R1 is formed inside the wafer to be processed W as described above, a part of the wafer to be processed W remains on the support wafer S after the peripheral edge We is removed. For this reason, after removing the peripheral portion We, a part of the remaining wafer W to be processed may be removed by etching.
- the modified surface R2 is formed inside the device layer D at the peripheral edge We (outside the modified layer M).
- this processing method for example, there are three methods as shown in FIG.
- the first processing method is a method in which the condensing point of the laser beam L from the laser head 200 is positioned inside the processing target wafer W and above the device layer D as shown in FIG. is there.
- the energy of the laser beam L is reduced to such an extent that the processing target wafer W is not modified even when the laser beam L is condensed.
- the laser beam L is once condensed inside the wafer to be processed W, but the laser beam L spread after being further defocused passes through the wafer to be processed W and is irradiated onto the device layer D.
- the laser light L is absorbed by the device layer D, and the device layer D causes ablation.
- the laser head 200 irradiates the laser beam L while rotating the chuck 91 by the rotating mechanism 93 and moving the laser head 200 radially outward by the moving mechanism 201. Then, the modified surface R2 is formed on the device layer D.
- the chuck 91 may be moved in the radial direction by the moving mechanism 92, or both the laser head 200 and the chuck 91 may be moved.
- the second processing method is a method in which the condensing point of the laser beam L from the laser head 200 is positioned inside the device layer D as shown in FIG.
- the laser beam L passes through the wafer W to be processed and is applied to the device layer D, and the device layer D is ablated.
- the laser head 200 irradiates the laser beam L while rotating the chuck 91 by the rotating mechanism 93 and moving the laser head 200 radially outward by the moving mechanism 201.
- the modified surface R2 is formed on the device layer D.
- the chuck 91 may be moved in the radial direction by the moving mechanism 92, or both the laser head 200 and the chuck 91 may be moved.
- the third processing method is a method in which the condensing point of the laser beam L from the laser head 200 is positioned below the device layer D as shown in FIG.
- the laser beam L passes through the wafer W to be processed and is applied to the device layer D, and the device layer D is ablated.
- the laser beam L is formed in the device layer D, it is not condensed below the device layer D.
- the laser head 200 irradiates the laser beam L while rotating the chuck 91 by the rotating mechanism 93 and moving the laser head 200 radially outward by the moving mechanism 201.
- the modified surface R2 is formed on the device layer D.
- the chuck 91 may be moved in the radial direction by the moving mechanism 92, or both the laser head 200 and the chuck 91 may be moved.
- the eccentricity detection unit 97 images the overlapped wafer T and detects the eccentricity of the wafer W to be processed in the overlapped wafer T. The detection result of the eccentricity detection unit 97 is output to the control device 60.
- the central axis of the chuck 91 or the irradiation axis of the laser light L from the laser head 200 is adjusted based on the detection result of the eccentricity detection unit 97.
- the chuck 91 is moved in the horizontal direction by the moving mechanism 92 to adjust the position of the center of the wafer W to be processed in the overlapped wafer T.
- the laser head 94 is moved in the horizontal direction by the moving mechanism 201. In any case, the laser beam L irradiated to the wafer W to be processed from the laser head 200 can be prevented from being decentered, and the annular modified surface R1 or R2 can be formed on the wafer W to be processed at an appropriate position. .
- the overlapped wafer T is transferred to the processing unit 90 of the processing apparatus 50 by the wafer transfer device 32.
- the processing unit 90 after the superposed wafer T is delivered to and held by the chuck, the horizontal direction of the processing target wafer W is adjusted by a detection unit (not shown).
- the eccentricity detection unit 97 images the superposed wafer T, and the eccentricity of the wafer W to be processed in the superposed wafer T is detected. Based on the detection result of the eccentricity of the wafer W to be processed, the central axis of the chuck 91, the irradiation axis of the laser light L from the laser head 94, or the irradiation axis of the laser light L from the laser head 200 is adjusted.
- the laser head 94 is moved above the peripheral edge We. Thereafter, the laser beam L is irradiated from the laser head 94 to the inside of the processing target wafer W while the chuck 91 is rotated, and the modified layer M is formed at a predetermined position inside the processing target wafer W as shown in FIG. Is formed. At this time, when the central axis of the chuck 91 or the irradiation axis of the laser light L from the laser head 94 is adjusted, the modified layer M can be appropriately formed.
- the laser head 94 is retracted and the laser head 200 is moved above the peripheral edge We. Then, the laser head 200 is irradiated with laser light while rotating the chuck 91 and moving the laser head 200 radially outward. Then, the modified surface R1 or R2 is formed inside the processing target wafer W or on the device layer D as shown in FIG. At this time, when the central axis of the chuck 91 or the irradiation axis of the laser beam L from the laser head 200 is adjusted, the modified surface R1 or R2 can be appropriately formed.
- the overlapped wafer T is transferred by the transfer unit 80 to the chuck 71 at the transfer position A0, and the chuck 71 is moved to the first processing position A1.
- the processed surface Wg of the wafer W to be processed is ground by the rough grinding wheel 132.
- the peripheral edge We is peeled off and removed from the modified layer M and the crack C as base points.
- the modified surface R1 or R2 is formed at the interface between the wafer to be processed W and the support wafer S and the bonding force is reduced, the peripheral edge We can be appropriately removed.
- the chuck 71 is moved to the second processing position A2. Then, the processing surface Wg of the processing target wafer W is ground by the middle grinding unit 140. In the rough grinding unit 130 described above, when the peripheral edge portion We cannot be completely removed, the peripheral edge portion We is completely removed by the intermediate grinding unit 140.
- the chuck 71 is moved to the third processing position A3. Then, the processed surface of the wafer W to be processed is finish-ground by the finish grinding unit 150.
- the subsequent processing for the processing target wafer W is the same as in the above embodiment. That is, cleaning of the non-joint surface Sn in the second cleaning unit 120, cleaning of the processed surface Wg in the first cleaning unit 110, wet etching of the processed surface Wg in the wet etching apparatuses 40 and 41, and the like are performed. Thus, a series of wafer processing in the substrate processing system 1 is completed.
- the same effects as those in the above embodiment can be enjoyed. Further, based on the eccentricity detection result of the wafer W to be processed by the eccentricity detection unit 97, the central axis of the chuck 91, the irradiation axis of the laser light L from the laser head 94, or the irradiation axis of the laser light L from the laser head 200 is determined. Adjusted. For this reason, the modified layer M and the modified surface R1 or R2 can be appropriately formed.
- the same chuck 91 is used to form the modified layer M and the modified surface R1 or R2. Therefore, in the processing by the laser head 94 and the processing by the laser head 200, The wafer W to be processed is not eccentric. As a result, the position of the modified layer M and the inner peripheral position of the modified surface R1 or R2 can be matched, and the peripheral edge We can be more appropriately removed.
- the modified surface R1 or R2 is formed by irradiating the inside of the wafer to be processed W with laser light. Particles) can be suppressed. Further, even when a void remains in the peripheral edge We when the wafer to be processed W and the support wafer S are bonded, the void is removed by forming the modified surface R1 or R2 as in this embodiment. It is also possible.
- the eccentricity detection unit 97 may be provided in an eccentricity detection device (not shown) outside the processing device 50.
- the eccentricity detection unit 97 may be provided in an eccentricity detection device (not shown) outside the processing device 50.
- the center of the wafer W to be processed and the chuck 91 are The superposed wafer T is transported so that the centers coincide.
- the modified layer M can be appropriately formed on the wafer W to be processed as shown in FIG. 16A, and the inside or device layer of the wafer W to be processed as shown in FIG.
- the modified surface R1 or R2 can be appropriately formed.
- the laser head 94 and the laser head 200 do not need to be provided separately, and may be a common head. Further, the laser head 94 and the laser head 200 in the processing unit 90 may be provided in different apparatuses, and may be provided in the modified layer forming apparatus and the interface processing apparatus, respectively.
- the present embodiment can also be applied to the case where a second wafer to be processed W2 is further stacked on the superposed wafer T as shown in FIG. That is, the eccentricity detection unit 97 detects the eccentricity of the second wafer to be processed W2 that is further laminated and bonded to the overlapped wafer T. Even in such a case, the modified surface R1 or R2 can be appropriately formed based on the detection result of the eccentricity of the processing target wafer W with respect to the overlapped wafer T. At this time, if the position of the peripheral edge We removed by the second wafer to be processed W2 coincides with the position of the overlapped wafer T, the formation of the modified surface R1 or R2 can be omitted.
- the inner peripheral positions of the modified surfaces R1 and R2 formed on the wafer W to be processed coincide with the position of the modified layer M.
- FIG. 17 shows a case where the wafer W to be processed is eccentrically bonded to the overlapped wafer T, and the position of the modified layer M and the inner peripheral position of the modified surface R1 are shifted. Show.
- the modified layer M is located radially inward from the inner periphery of the modified surface R1, and the modified layer M is positioned radially outward from the inner periphery of the modified surface R1. There is a place.
- the processing surface Wg is ground as shown in FIG.
- the width D1 of the removed peripheral portion becomes smaller than the target width D2 of the peripheral portion We to be removed.
- the outer surface of the wafer W to be processed after the peripheral portion is removed may become rough.
- the processed surface Wg of the wafer W to be processed is ground as shown in FIG. 19 (b).
- the modified surface R1 remains between the processing target wafer W and the device layer D. In the portion having the modified surface R1, the wafer W to be processed and the device layer D may be peeled off, and chipping may occur.
- the following two methods are conceivable as a method of eliminating such a shift between the position of the modified layer M and the inner peripheral position of the modified surface R1.
- the first deviation elimination method is a method of detecting the eccentricity of the wafer W to be processed in the overlapped wafer T and adjusting the position of the modified layer M or the inner peripheral position of the modified surface R1 based on the detection result. is there.
- the second deviation elimination method detects the position of the modified layer M or the inner peripheral position of the modified surface R1, and based on the detection result, the modified surface R1 or the modified layer formed in the subsequent processing. This is a method of adjusting the position of M.
- the first deviation elimination method is a method of forming the modified layer M and the modified surface R1 by the method shown in FIG. 16 using the processing unit 90 shown in FIG. That is, in the processing unit 90, the eccentricity detection unit 97 images the superposed wafer T and detects the eccentricity of the wafer W to be processed in the superposed wafer T. Based on the detection result of the eccentricity of the wafer W to be processed, the central axis of the chuck 91, the irradiation axis of the laser light L from the laser head 94, or the irradiation axis of the laser light L from the laser head 200 is adjusted.
- the modified layer M can be appropriately formed on the processing target wafer W as shown in FIG. Further, by adjusting the central axis of the chuck 91 or the irradiation axis of the laser head 200, the modified surface R1 can be appropriately formed on the processing target wafer W as shown in FIG.
- the modification is performed by adjusting the central axis of the chuck 91, the irradiation axis of the laser head 94, or the irradiation axis of the laser head 200 based on the detection result of the eccentricity of the wafer W to be processed by the eccentricity detection unit 97.
- the position of the layer M and the inner peripheral position of the modified surface R1 can be matched.
- the processing unit 90 further includes a position detection unit 210 in the configuration of the processing unit 90 shown in FIG.
- the position detection unit 210 is disposed above the outer periphery of the chuck 91.
- the position detection unit 210 is configured to be movable in the X-axis direction, the Y-axis direction, and the Z-axis direction by a moving mechanism (not shown).
- a moving mechanism not shown.
- an IR camera using infrared rays is used for the position detection unit 210. Then, the position detection unit 210 detects the position of the modified layer M formed on the processing target wafer W or the inner peripheral position of the modified surface R1 with respect to the overlapped wafer T held by the chuck 91.
- the second deviation elimination method is performed using the detection result in the position detection unit 210.
- a description will be given along the case where the wafer processing shown in FIG. 16 is performed in the substrate processing system 1.
- the modified layer M is formed on the processing target wafer W using the laser head 94 as shown in FIG.
- the position detection unit 210 images the modified layer M inside the processing target wafer W using infrared rays, and detects the position of the modified layer M. .
- the detection result of the position detection unit 210 is output to the control device 60.
- the control device 60 adjusts the central axis of the chuck 91 or the irradiation axis of the laser head 200 based on the detection result of the position detector 210, that is, the position of the modified layer M. Then, the modified surface R1 can be appropriately formed on the processing target wafer W as shown in FIG. As a result, the position of the modified layer M and the inner peripheral position of the modified surface R1 can be matched.
- the order of forming the modified layer M shown in FIG. 16A and the formation of the modified surface R1 shown in FIG. 16B may be reversed.
- the modified surface R1 is imaged using infrared rays by the position detection unit 210, and the inner peripheral position of the modified surface R1 is detected.
- the detection result of the position detection unit 210 is output to the control device 60.
- the control device 60 adjusts the central axis of the chuck 91 or the irradiation axis of the laser head 94 based on the detection result of the position detection unit 210, that is, the inner peripheral position of the modified surface R1. Then, the modified layer M can be appropriately formed on the processing target wafer W. As a result, the position of the modified layer M and the inner peripheral position of the modified surface R1 can be matched.
- the modified layer M is formed at one place so that the lower end thereof is located above the target surface after grinding of the wafer W to be processed.
- the method for forming the modified layer M is not limited to this.
- a plurality of modified layers M may be formed in the thickness direction of the wafer W to be processed.
- the modified layers M1 to M4 are formed in a plurality of stages, for example, four stages in the thickness direction of the wafer W to be processed.
- the lower end of the lowermost modified layer M4 is located above the target surface (the dotted line in FIG. 21A) of the wafer W to be processed after grinding. Further, the cracks C developed by the modified layers M1 to M4 reach the processed surface Wg and the non-processed surface Wn of the wafer W to be processed.
- the modified layers M1 and M2 are formed in a plurality of stages, for example, two stages in the thickness direction of the wafer W to be processed.
- the lower end of the lower modified layer M2 is located above the target surface of the wafer W to be processed after grinding (dotted line in FIG. 21B).
- the cracks C developed by the modified layers M1 and M2 reach the non-processed surface Wn of the wafer W to be processed, but do not reach the processed surface Wg.
- the processing surface Wg remains on the wafer W to be processed until the grinding surface of the rough grinding wheel 132 reaches the crack C.
- the modified layers M1 to M4 are formed in a plurality of stages, for example, four stages in the thickness direction of the wafer W to be processed.
- the lower end of the lowermost modified layer M4 is positioned below the target surface (the dotted line in FIG. 21C) of the wafer W to be processed after grinding.
- the cracks C developed by the modified layers M1 to M4 reach the processed surface Wg and the non-processed surface Wn of the wafer W to be processed.
- the modified layer M4 is formed at the boundary between the peripheral edge We and the central part Wc in the wafer to be processed W after grinding, the peripheral edge We can be more reliably peeled and removed.
- the modified layer M4 When the modified layer M4 is formed below the target surface in this way, control is performed by blurring the laser beam so that cracks C extending from the modified layer M4 are unlikely to occur. If it does so, it can suppress generating the crack C to the support wafer S joined to the to-be-processed wafer W.
- FIG. Although the position of the crack C changes in the entire circumferential direction, since the lower end of the modified layer M4 can be controlled in this way, it can be removed with high accuracy.
- the modified layers M1 to M4 are formed in a plurality of stages, for example, four stages in the thickness direction of the wafer W to be processed.
- the lower end of the lowermost modified layer M4 is located inside the device layer D.
- the cracks C developed by the modified layers M1 to M4 reach the processing surface Wg of the wafer W to be processed. Even in such a case, since the modified layer M4 is formed at the boundary between the peripheral edge portion We and the central portion Wc in the wafer to be processed W after grinding, the peripheral edge portion We can be more reliably peeled and removed.
- the modified surface R2 when the modified surface R2 is formed in the device layer D as shown in FIG. 14 described above, the influence of the ablation in the device layer D of the peripheral edge portion We is affected by the device layer D in the inner central portion Wc. There is a risk. In such a case, it is preferable to form the modified surface R2 after forming the modified layer M4 on the device layer D as shown in FIG.
- the modified layer M4 plays a role of stopping the influence of ablation, and can reliably prevent the influence of the ablation from reaching the central portion Wc.
- FIG. 21 a method of forming a plurality of modified layers M in the thickness direction of the wafer W to be processed is arbitrary.
- FIG. 22 is a diagram in which a portion (boundary between the peripheral edge We and the central portion Wc) where the modified layer M is formed in the processing target wafer W is developed on a plane. That is, the horizontal direction in FIG. 22 indicates the circumferential direction of the boundary between the peripheral edge portion We and the central portion Wc, and the vertical direction indicates the thickness direction of the wafer W to be processed.
- dotted lines indicate the modified layers M1 to M4, and a plurality of modified layers M1 to M4 are formed in the thickness direction of the wafer W to be processed.
- the processing unit 90 irradiates the inside of the wafer W to be processed from the laser head 94 fixed in the vertical direction while rotating the chuck 91 by the rotation mechanism 93.
- the annular modified layer M4 is formed.
- the laser head 94 is raised to a predetermined position, that is, a position where the modified layer M3 is formed by the lifting mechanism 96.
- the laser head 94 is irradiated with laser light while rotating the chuck 91 to form an annular modified layer M3.
- the modified layers M2 and M1 are formed in the same manner, and the modified layers M1 to M4 are formed on the wafer W to be processed.
- the irradiation of the laser beam from the laser head 94 may be controlled on and off while the chuck 91 continues to rotate. For example, the laser beam is irradiated from the laser head 94 to the inside of the processing target wafer W while the chuck 91 is rotated to form the modified layer M4. Thereafter, the irradiation of the laser beam from the laser head 94 is stopped while the rotation of the chuck 91 is continued. Subsequently, the laser head 94 is raised, and the laser beam is irradiated again from the laser head 94 to the inside of the processing target wafer W, thereby forming the modified layer M3.
- the irradiation start position and irradiation end position of the laser beam when forming the modified layer M4 next time are stored.
- the end position can be adjusted.
- the irradiation waiting time of the laser beam during the acceleration and deceleration of the chuck 91 can be shortened, and the entire processing time can be shortened.
- laser processing can be performed uniformly, and the horizontal pitches of the modified layers M can be made equal.
- the laser head 94 is moved to a predetermined position, that is, the modified layer M3 by the lifting mechanism 96 in a state where the rotation of the chuck 91 and the irradiation of the laser beam from the laser head 94 are continued. Is raised to the position where it is formed.
- the laser head 94 irradiates laser light while rotating the chuck 91 to form an annular modified layer M3.
- the modified layers M2 and M1 are formed in the same manner, and the modified layers M1 to M4 are formed on the wafer W to be processed. In such a case, since the modified layers M1 to M4 can be formed continuously, the time required for the processing can be shortened as compared with the processing method shown in FIG.
- the modified layers M1 to M4 are continuously formed in a spiral shape. Even in such a case, since the modified layers M1 to M4 can be formed continuously, the time required for the processing can be shortened as compared with the processing method shown in FIG. In addition, the modified layers M1 to M4 are not formed with a steep slope in a side view, and are uniformly formed in the vertical direction (thickness direction of the wafer W to be processed) as compared with the processing method shown in FIG. can do.
- the annular modified layer M is formed inside the processing target wafer W.
- a plurality of layers extending radially outward from the annular modified layer M are formed.
- a radially modified layer M ′ may be further formed.
- the peripheral portion We is removed by the processing unit 90, the peripheral portion We is divided into a plurality of portions by the radial direction modified layer M ′ while being separated from the annular modified layer M as a base point. If it does so, the peripheral part We to be removed becomes small and can be removed more easily.
- peripheral edge We edge piece
- the layer M ′′ may be formed.
- the peripheral edge We to be removed can be further reduced.
- the peripheral edge to be removed can be controlled by controlling the radial interval of the divided modified layer M ′′. The size of the small piece of the portion We can be controlled.
- the divided modified layers M ′′ may be formed in a spiral shape in plan view as shown in FIG.
- the processing unit 90 irradiates the wafer W to be processed from the laser head 94 while rotating the chuck 91 while moving the chuck 91 or the laser head 94 in the horizontal direction.
- the spiral divided modified layer M ′′ can be continuously formed. As a result, the time required for processing can be shortened.
- the divided modified layer M ′′ may be formed in a spiral shape and meandering in a plan view.
- the processing unit 90 the chuck 91 or the laser head 94 is placed in the horizontal direction. While moving, the laser beam is irradiated from the laser head 94 to the processing target wafer W while rotating the chuck 91. At this time, by controlling the phase, period and amplitude of the movement of the chuck 91 or the laser head 94, A meandering wave-shaped divided modified layer M ′′ can be formed. Further, the divided modified layer M ′′ is formed two or more times.
- the size of the small pieces of the peripheral edge portion We to be removed can be reduced. Can be controlled.
- the radial direction modification layer M ′ illustrated in FIGS. 23 and 24 is not necessary.
- the divided modified layer M ′′ may be formed so that the crack C extending from the divided modified layer M ′′ extends to a predetermined position inside the wafer W to be processed. Good. That is, the crack C reaches the non-processed surface Wn of the wafer W to be processed, but does not reach the processed surface Wg. In this case, for example, when the rough grinding wheel 132 is lowered in the rough grinding unit 130 to grind the work surface Wg, until the grinding surface of the rough grinding stone 132 reaches the crack C, as shown in FIG.
- the processing surface Wg is ground including the peripheral edge portion We of the wafer W to be processed.
- the peripheral edge We is peeled off and removed below the crack C.
- the size (height) of the small piece of the peripheral edge We to be removed can be controlled.
- the divided modified layer M ′′ is formed in two stages. However, by adjusting the condensing point from the laser head 94 to two, It is also possible to form the divided modified layers M ′′ at the same time.
- the configuration of the substrate processing system 1 of the present disclosure is not limited to the present embodiment.
- the laser head 94 for forming the modified layer M and the laser head 200 for forming the modified surface R1 or R2 are each provided in the processing unit 90 that aligns the overlapped wafer T.
- the configuration is not limited to this.
- the modified layer forming unit for forming the modified layer M and the interface processing unit for forming the modified surface R1 or R2 may be provided separately from the processing unit 90, respectively.
- the modified layer forming unit includes a laser head 94, a moving mechanism 95, and an elevating mechanism 96.
- the interface processing unit includes a laser head 200, a moving mechanism 201, and an elevating mechanism 202.
- the modified layer forming unit and the interface treatment unit can be arranged at arbitrary positions as long as the transport unit 80 can transport the superposed wafer T.
- the modified layer forming unit and the interface processing unit may be provided by being stacked on the processing unit 90. Alternatively, it may be provided at a position adjacent to the processing unit 90 in the horizontal direction, for example, at a position opposite to the processing unit 90 with the moving mechanism 83 interposed therebetween.
- the modified layer forming unit or the interface treatment unit may be disposed inside the processing apparatus 50. Alternatively, both the modified layer forming unit and the interface processing unit may be disposed outside the processing apparatus 50.
- the substrate processing system 1 of the present embodiment may be provided with a CMP apparatus (CMP: Chemical Mechanical Polishing, chemical mechanical polishing) for polishing the processed surface Wg of the wafer W to be processed.
- CMP apparatus Chemical Mechanical Polishing, chemical mechanical polishing
- a cleaning device for cleaning the processed surface Wg after polishing may be provided.
- the CMP apparatus may be provided, for example, on the Y-axis negative direction side of the wafer transfer region 30 in the processing station 3.
- the cleaning device may be provided so as to be stacked on the wet etching devices 40 and 41 on the positive side in the X-axis direction of the wafer transfer region 30, for example.
- the processing target wafer W and the support wafer S are bonded by a bonding apparatus outside the substrate processing system 1.
- a bonding apparatus is provided inside the substrate processing system 1. It may be provided.
- cassettes Cw, Cs, and Ct that can accommodate a plurality of wafers W to be processed, a plurality of support wafers S, and a plurality of superposed wafers T are carried in and out of the carry-in / out station 2 of the substrate processing system 1.
- these cassettes Cw, Cs, and Ct can be mounted in a row in the X-axis direction.
- the bonding apparatus bonds the non-processed surface Wn of the processing target wafer W and the bonding surface Sj of the support wafer S by van der Waals force and hydrogen bond (intermolecular force).
- the non-processed surface Wn and the joining surface Sj are modified and made hydrophilic.
- oxygen gas or nitrogen gas which is a processing gas, is excited to be turned into plasma and ionized.
- This oxygen ion or nitrogen ion is irradiated to the non-processed surface Wn and the bonding surface Sj, and the non-processed surface Wn and the bonding surface Sj are plasma-treated and activated. Further, pure water is supplied to the non-processed surface Wn and the joint surface Sj thus modified to make the non-processed surface Wn and the joint surface Sj hydrophilic.
- the structure of a joining apparatus is arbitrary and a well-known joining apparatus can be used.
- the peripheral edge We of the wafer W to be processed is removed in the rough grinding unit 130 (or the rough grinding unit 130 and the intermediate grinding unit 140), but the configuration of the peripheral edge removal device is not limited to this.
- the peripheral edge We may be removed by applying a force to the outside of the modified layer M.
- the method of applying the force in this way is arbitrary, but, for example, a grindstone wheel (not shown) or a blade (not shown) is brought into contact with the peripheral edge portion We and an impact is applied to the peripheral edge portion We. By this impact, the peripheral edge We is removed by peeling off the modified layer M and the crack C as the base points.
- the processing target wafer W and the support wafer S are directly bonded has been described.
- the processing target wafer W and the support wafer S may be bonded via an adhesive.
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Abstract
Description
本願は、2018年4月27日に日本国に出願された特願2018-87713号に基づき、優先権を主張し、その内容をここに援用する。
これに対して、本実施形態では、被処理ウェハWの内部に改質層Mを形成することで、当該改質層MとクラックCを基点に周縁部Weを除去することができる。かかる場合、支持ウェハSの接合面Sjが研削等によるダメージを被ることがない。
これに対して、本実施形態では、被処理ウェハWの内部に形成した改質層MとクラックCを基点に周縁部Weを剥離させて除去するので、パーティクルが発生しない。
これに対して、本実施形態では、レーザを用いて被処理ウェハWの内部に改質層Mを形成するので、例えば1μm未満の高い精度を確保できる。このため、改質層Mを基点として除去される周縁部Weの幅(トリム幅)の精度も向上する。
これに対して、本実施形態では、高周波のレーザを用いて被処理ウェハWの内部に改質層Mを形成するので、チャック91の回転速度を速くすることができ、極めて短時間で処理を行うことができる。したがって、ウェハ処理のスループットを向上させることができる。
これに対して、本実施形態では、レーザヘッド94自体が経時的に劣化することはなく、メンテナンス頻度を低減することができる。また、レーザを用いたドライプロセスであるため、研削水や廃水処理が不要となる。このため、ランニングコストを低廉化することができる。
これに対して、本実施形態では、例えば処理ユニット90において、被処理ウェハWとレーザ光を相対的に動作制御することにより、改質層Mをノッチの形状に合わせて形成することができ、ノッチの形状を残したまま、周縁部Weを容易に除去することもできる。
これに対して、本実施形態では、第2の被処理ウェハW2の内部に改質層Mを形成することで、当該改質層MとクラックCを基点に周縁部Weを容易に除去することができる。
これに対して、本実施形態では、レーザを用いて第2の被処理ウェハW2の内部に改質層Mを形成するので、高い精度を確保することができ、第2の被処理ウェハW2を適切に積層することができる。
また、仮に被処理ウェハWと支持ウェハSを接合する際に、周縁部Weにボイドが残存したとしても、本実施形態のように改質面R1又はR2を形成することで、ボイドを除去することも可能となる。
50 加工装置
90 処理ユニット
130 粗研削ユニット
S 支持ウェハ
T 重合ウェハ
W 被処理ウェハ
Claims (21)
- 基板を処理する基板処理システムであって、
第1の基板と第2の基板が接合された重合基板における、前記第1の基板の偏心を検出する偏心検出装置と、
前記第1の基板における除去対象の周縁部と中央部との境界に沿って当該第1の基板の内部に改質層を形成する改質層形成装置と、
前記改質層を基点に前記周縁部を除去する周縁除去装置と、を有する。 - 請求項1に記載の基板処理システムにおいて、
前記偏心検出装置、前記改質層形成装置、及び前記周縁除去装置を制御する制御装置を有し、
前記改質層形成装置は、前記重合基板を保持する保持部と、前記保持部に保持された前記重合基板に対し、前記第1の基板の内部に前記改質層を形成する改質部と、を備え、
前記制御装置は、前記偏心検出装置の検出結果に基づいて、前記改質部による処理に対し、前記保持部に保持された前記重合基板における前記第1の基板の中心を調整する。 - 請求項2に記載の基板処理システムにおいて、
前記改質部は、前記第1の基板の内部にレーザ光を照射して前記改質層を形成し、
前記制御装置は、前記偏心検出装置の検出結果に基づいて、前記保持部の中心軸又は前記改質部からのレーザ光の照射軸を調整する。 - 請求項2に記載の基板処理システムにおいて、
前記偏心検出装置、前記改質層形成装置、及び前記周縁除去装置に対して、前記重合基板を搬送する搬送装置を有し、
前記制御装置は、前記偏心検出装置の検出結果に基づいて、前記第1の基板の中心と前記保持部の中心とを一致させて前記重合基板を前記保持部に搬送するように前記搬送装置を制御する。 - 請求項2に記載の基板処理システムにおいて、
前記周縁除去装置は、前記第1の基板の非接合面を研削する研削ユニットと、前記重合基板の位置調整を行う処理ユニットと、を備え、
前記改質層形成装置の前記保持部及び前記改質部は、前記処理ユニットに設けられ、
前記制御装置は、前記偏心検出装置の検出結果に基づいて、前記処理ユニットを制御する。 - 請求項1に記載の基板処理システムにおいて、
前記重合基板を保持する他の保持部と、前記他の保持部に保持された前記重合基板に対し、前記第1の基板の前記周縁部における前記第2の基板との界面を改質する界面処理部と、を備えた界面処理装置と、
前記偏心検出装置、前記改質層形成装置、前記周縁除去装置、及び前記界面処理装置を制御する制御装置を有し、
前記制御装置は、前記偏心検出装置の検出結果に基づいて、前記界面処理部による処理に対し、前記他の保持部に保持された前記重合基板の前記第1の基板の中心を調整する。 - 請求項6に記載の基板処理システムにおいて、
前記界面処理部は、前記界面にレーザ光を照射して当該界面を改質し、
前記制御装置は、前記偏心検出装置の検出結果に基づいて、前記他の保持部の中心軸又は前記界面処理部からのレーザ光の照射軸を調整する。 - 請求項6に記載の基板処理システムにおいて、
前記偏心検出装置、前記改質層形成装置、前記周縁除去装置、及び前記界面処理装置に対して、前記重合基板を搬送する搬送装置と、を有し、
前記制御装置は、前記偏心検出装置の検出結果に基づいて、前記第1の基板の中心と前記他の保持部の中心とを一致させて前記重合基板を前記他の保持部に搬送するように前記搬送装置を制御する。 - 請求項6に記載の基板処理システムにおいて、
前記周縁除去装置は、前記第1の基板の非接合面を研削する研削ユニットと、前記重合基板の位置調整を行う処理ユニットと、を備え、
前記改質層形成装置の前記他の保持部及び前記界面処理部は、前記処理ユニットに設けられ、
前記制御装置は、前記偏心検出装置の検出結果に基づいて、前記処理ユニットを制御する。 - 請求項1に記載の基板処理システムにおいて、
前記第1の基板と前記第2の基板を接合する接合装置を有する。 - 請求項1に記載の基板処理システムにおいて、
前記偏心検出装置は、前記重合基板に対し、前記第1の基板に積層される第3の基板の偏心を検出し、
前記改質層形成装置は、前記第3の基板における除去対象の周縁部と中央部との境界に沿って当該第3の基板の内部に改質層を形成し、
前記周縁除去装置は、前記第3の基板の前記改質層を基点に当該第3の基板の前記周縁部を除去する。 - 基板を処理する基板処理方法であって、
第1の基板と第2の基板が接合された重合基板における、前記第1の基板の偏心を検出する偏心検出工程と、
その後、前記第1の基板における除去対象の周縁部と中央部との境界に沿って当該第1の基板の内部に改質層を形成する改質層形成工程と、
その後、前記改質層を基点に前記周縁部を除去する周縁除去工程と、を有する。 - 請求項12に記載の基板処理方法において、
前記改質層形成工程では、保持部に保持された前記重合基板に対し、改質部によって前記第1の基板の内部に前記改質層を形成し、
前記改質層形成工程を行う前に、前記偏心検出工程の検出結果に基づいて、前記改質部による処理に対し、前記保持部に保持された前記重合基板における前記第1の基板の中心を調整する。 - 請求項13に記載の基板処理方法において、
前記改質層形成工程において、前記改質部によって前記第1の基板の内部にレーザ光を照射して前記改質層を形成し、
前記改質層形成工程を行う前に、前記偏心検出工程の検出結果に基づいて、前記保持部の中心軸又は前記改質部からのレーザ光の照射軸を調整する。 - 請求項13に記載の基板処理方法において、
前記改質層形成工程を行う前に、前記偏心検出工程の検出結果に基づいて、前記第1の基板の中心が前記保持部の中心と一致するように、前記重合基板を前記保持部に搬送する。 - 請求項13に記載の基板処理方法において、
前記周縁除去工程では、処理ユニットにおいて前記重合基板の位置調整を行った後、研削ユニットにおいて前記第1の基板の非接合面を研削して前記周縁部を除去し、
前記保持部及び前記改質部は、前記処理ユニットに設けられ、
前記処理ユニットにおいて、前記偏心検出工程の検出結果に基づき、前記改質部による処理に対し、前記保持部に保持された前記重合基板における前記第1の基板の中心を調整する。 - 請求項12に記載の基板処理方法において、
他の保持部に保持された前記重合基板に対し、界面処理部によって前記第1の基板の前記周縁部における前記第2の基板との界面を改質する界面処理工程を有し、
前記界面処理工程を行う前に、前記偏心検出工程の検出結果に基づいて、前記界面処理部による処理に対し、前記他の保持部に保持された前記重合基板の前記第1の基板の中心を調整する。 - 請求項17に記載の基板処理方法において、
前記界面処理工程において、前記界面処理部によって前記界面にレーザ光を照射し当該界面を改質し、
前記界面処理工程を行う前に、前記偏心検出工程の検出結果に基づいて、前記他の保持部の中心軸又は前記界面処理部からのレーザ光の照射軸を調整する。 - 請求項17に記載の基板処理方法において、
前記界面処理工程を行う前に、前記偏心検出工程の検出結果に基づいて、前記第1の基板の中心が前記他の保持部の中心と一致するように、前記重合基板を前記他の保持部に搬送する。 - 請求項17に記載の基板処理方法において、
前記周縁除去工程では、処理ユニットにおいて前記重合基板の位置調整を行った後、研削ユニットにおいて前記第1の基板の非接合面を研削して前記周縁部を除去し、
前記他の保持部及び前記界面処理部は、前記処理ユニットに設けられ、
前記処理ユニットにおいて、前記偏心検出工程の検出結果に基づき、前記界面処理部による処理に対し、前記他の保持部に保持された前記重合基板における前記第1の基板の中心を調整する。 - 請求項12に記載の基板処理方法において、
前記周縁除去工程の後、前記第1の基板に第3の基板を積層して接合する接合工程と、
その後、前記重合基板において、前記第1の基板に積層される第3の基板の偏心を検出する他の偏心検出工程と、
その後、前記第3の基板における除去対象の周縁部と中央部との境界に沿って当該第3の基板の内部に改質層を形成する他の改質層形成工程と、
その後、前記第3の基板の前記改質層を基点に当該第3の基板の前記周縁部を除去する他の周縁除去工程と、を有する。
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| JP7109537B2 (ja) | 2022-07-29 |
| KR102760744B1 (ko) | 2025-02-03 |
| US20210242010A1 (en) | 2021-08-05 |
| US11450523B2 (en) | 2022-09-20 |
| KR20210005110A (ko) | 2021-01-13 |
| CN117912996A (zh) | 2024-04-19 |
| TW201946131A (zh) | 2019-12-01 |
| KR20250020692A (ko) | 2025-02-11 |
| KR102890998B1 (ko) | 2025-11-25 |
| JPWO2019208359A1 (ja) | 2021-05-13 |
| CN112005341A (zh) | 2020-11-27 |
| CN117912995A (zh) | 2024-04-19 |
| TWI821273B (zh) | 2023-11-11 |
| CN112005341B (zh) | 2024-01-09 |
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